3 Scotch-Weld TM. Urethane Adhesives 3532 B/A 3535 B/A 3549 B/A. Technical Data March, 2002

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1 3 Scotch-Weld TM Technical Data March, 2002 Product Description 3M TM Scotch-Weld TM 3532 B/A, 3535 B/A and 3549 B/A are two-component, polyurethane adhesives which cure at room temperature or with heat to form tough, impact-resistant structural bonds. Their adhesion properties are identical and they vary only in work life, cure time and color. They provide excellent adhesion to many primed or painted metal and plastic substrates and are designed to develop sag resistance approximately 30 seconds after mixing. 3M TM EC-1945 B/A Primer is suggested for use on metal surfaces to achieve maximum resistance to water, humidity and salt spray. For best results it is also suggested that the primer itself or primer/adhesive system be heat cured (see Primer Information in Directions for Use section on page 2). Typical Physical Properties Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes B/A Adhesive Base Accelerator Color (Cured: Brown) Off-White Brown Base Polyol Isocyanate Net Weight (lbs./gal.) Viscosity Brookfield RVF #6 sp. Brookfield RVF #5 sp. 75 F (24 20 rpm: 10,000-55, rpm: 15,000-40,000 cps Mix Ratio: By Weight By Volume Work Life: 100 grams mixed at 75 F (24 C): 5-15 min. Time to Reach Full 75 F (24 C) 24 hours 3535 B/A Adhesive Base Accelerator Color (Cured: Off-White) White Brown Base Polyol Isocyanate Net Weight (lbs./gal.) Viscosity Brookfield RVF #6 sp. Brookfield RVF #5 sp. 75 F (24 10 rpm: 5,000-40, rpm: 15,000-40,000 cps Mix Ratio: By Weight By Volume Work Life: 100 grams mixed at 75 F (24 C): 45 sec.-240 sec. Time to Reach Full 75 F (24 C) 8 hours

2 Typical Physical Properties (continued) 3549 B/A Adhesive Base Accelerator Color (Cured: Brown) Off-White Brown Base Polyol Isocyanate Net Weight (lbs./gal.) Viscosity Brookfield RVF #6 sp. Brookfield RVF #5 sp. 75 F (24 10 rpm: 10,000-40, rpm: 15,000-40,000 cps Mix Ratio: By Weight By Volume Work Life: 100 grams mixed at 75 F (24 C): min. Time to Reach Full 75 F (24 C) 7 days Application and Equipment Suggestions These products may be applied with spatula, trowel, or flow equipment. Appropriate two-part metering and mixing equipment is also commercially available. Directions for Use 1. Surfaces to be bonded must be dry and free from rust, oil, grease and wax. Surfaces can be cleaned with an abrasive such as 3M TM Coated Abrasives (240 grit) followed by wiping with a solvent such as Scotch-Grip TM Solvent No. 3.* 2. Primer Information: 3M EC-1945 B/A Primer is an amine-cured epoxy in blended ketone solvent. It has a 1-to-1 mix ratio by volume. Primer may be applied by spray, roller or brush. One coat is suggested, thickness 0.3 to 0.7 mils when dry. The primer must contain no solvent prior to application of adhesive. Drying time is dependent on various factors, including ambient temperature, air movement and relative humidity. Forced drying will provide uniform performance of the primer. Suggested dry times are approximately 10 min. at room temperature followed by 30 min. at 180 F (82 C) or a minimum of one hour at room temperature. Shorter dry times are possible at higher temperatures. The user should determine what is appropriate for the user s application. Mix parts A and B at least one hour before spray application. Pot life is eight hours after mixing parts A and B. Primed surface should be kept free of contamination prior to application of adhesive. *Note: When using solvents, extinguish all ignition sources and follow the manufacturer s precautions and directions for use when handling such materials

3 Typical Performance Characteristics Overlap Shear Strength-Metals: The following are typical data after a full cure showing the adhesion of 3532 B/A, 3535 B/A and 3549 B/A adhesives to various metal substrates. All aluminum data were developed on.063-inch thick 2024 T-3 clad aluminum and all steel data on.035-inch cold rolled steel. Test specimens were 1/2-inch overlap, 1-inch wide with.005-inch thick bondlines pulled at a testing rate of.1-inch/min. All values are psi. Substrate Test Temperature -40 F (-40 C) 75 F (24 C) 180 F (82 C) Etched Aluminum Abraded and Solvent Wiped Aluminum Solvent Wiped Aluminum Abraded and Solvent Wiped Steel Solvent Wiped Steel Abraded and Solvent Wiped Steel Primed with 3M Brand EC-1945 B/A Primer Abraded and Solvent Wiped Aluminum Primed with 3M Brand EC-1945 B/A Primer Room temperature cure of primer and adhesive F (82 C) cure of primer and adhesive. Overlap Shear Strength-Plastics: The following are typical data after a full cure showing the adhesion of 3532 B/A, 3535 B/A and 3549 B/A adhesives to various plastic substrates. All data were developed on 1/8-inch thick, 1/2-inch overlap, 1-inch wide specimens with.005-inch thick bondlines that had been abraded and alcohol wiped prior to bonding. Values are in psi. Substrate Test Temperature -40 F (-40 C) 75 F (24 C) 180 F (82 C) Nylon Lexan Plexiglass FRP Rigid PVC ABS Polystyrene Denotes substrate failure. Tensile and Elongation: Scotch-Weld 3532 B/A, 3535 B/A and 3549 B/A Urethane Adhesives have been tested according to ASTM-D-738 at 2 inches/min. Cure: 1 hour at 250 F (121 C), 30 min. at 285 F (141 C). Temperature Tensile Elongation Room Temperature 3000 psi 96% Rate of Strength Buildup: The following are typical test data showing the rate of strength buildup at various temperatures and times

4 Typical Performance Characteristics (continued) 3532 B/A Adhesive at room temperature Specimens: 1/2-inch overlap fiber reinforced plastic to primed steel, inch bondline. Specimens were pulled at 2 inches/min. Time (Hours) 3532 B/A Adhesive at various temperatures Specimens: 1/2-inch overlap shear, fiber reinforced plastic to primed steel.032-inch bondline. Specimens were placed in an oven at designated temperature for the specified time. Bonds were then cooled for 1 minute and pulled at a rate of 2-inch/min. Temperature Time (Minutes) 100 F (38 C) F (49 C) F (66 C) F (82 C) F (93 C) F (107 C) B/A Adhesive at 73 F (23 C) Specimens: 1/2-inch overlap prepared from 1 x 4-inch x 2024 T-3 clad FPL etched aluminum,.005-inch bondline. Specimens were pulled at 2 inches/min. Time (Minutes)

5 Typical Performance Characteristics (continued) 3535 B/A Adhesive at 150 F (66 C) Specimens: 1/2-inch overlap prepared from 1 x 4-inch x 2024 T-3 clad FPL etched aluminum,.005-inch bondline. Specimens were placed in 150 F (66 C) oven and cured for specified time. Time to reach 150 F (66 C) was 4 min. Specimens were then removed and tested at 2-in./min. During testing the specimens were a approximately 125 F (49 C). Time (Minutes) B/A Adhesive at room temperature Specimens: 1/2-inch overlap fiber reinforced plastic to primed steel, 0.32-inch bondline. Specimens were pulled at 2 inches/min. Time (Hours) B/A Adhesive at various temperatures Specimens: 1/2-inch overlap fiber reinforced plastic to primed steel,.032-inch bondline. Specimens were placed in an oven at designated temperature for the specified time. Bonds were then cooled for 1 min. and pulled at a rate of 2 inches/min. Temperature Time (Minutes) 150 F (66 C) F (82 C) F (93 C) F (107 C)

6 Storage and Shelf Life Storage: Store product at F (16-27 C) for maximum storage life. Higher temperatures reduce normal storage life. Lower temperatures cause increased viscosity of a temporary nature. Rotate stock on a first in-first out basis. Shelf Life: These products have a shelf life of one year from date of shipment when properly stored in their unopened containers. Precautionary Information Refer to Product Label and Material Safety Data Sheet for Health and Safety Information before using this product. For Additional Information To request additional product information or to arrange for sales assistance, call toll free or visit Address correspondence to: 3M Engineered Adhesives Division, 3M Center, Building 220-7E-01, St. Paul, MN Our fax number is In Canada, phone: In Puerto Rico, phone: In Mexico, phone: Important Notice 3M MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. User is responsible for determining whether the 3M product is fit for a particular purpose and suitable for user s method of application. Please remember that many factors can affect the use and performance of a 3M product in a particular application. The materials to be bonded with the product, the surface preparation of those materials, the product selected for use, the conditions in which the product is used, and the time and environmental conditions in which the product is expected to perform are among the many factors that can affect the use and performance of a 3M product. Given the variety of factors that can affect the use and performance of a 3M product, some of which are uniquely within the user s knowledge and control, it is essential that the user evaluate the 3M product to determine whether it is fit for a particular purpose and suitable for the user s method of application. Limitation of Remedies and Liability If the 3M product is proved to be defective, THE EXCLUSIVE REMEDY, AT 3M S OPTION, SHALL BE TO REFUND THE PURCHASE PRICE OF OR TO REPAIR OR REPLACE THE DEFECTIVE 3M PRODUCT. 3M shall not otherwise be liable for loss or damages, whether direct, indirect, special, incidental, or consequential, regardless of the legal theory asserted, including, but not limited to, contract, negligence, warranty, or strict liability. ISO 9002 This Engineered Adhesives Division product was manufactured under a 3M quality system registered to ISO 9002 standards. 3 Engineered Adhesives Division 3M Center, Building 220-7E-01 St. Paul, MN Recycled Paper 40% pre-consumer 10% post-consumer Lexan is a registered trademark of General Electric Co. Plexiglass is a registered trademark of Rohm & Haas Co. Printed in U.S.A. 3M (3/02)